4a+25-9a-16=21

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Solution for 4a+25-9a-16=21 equation: 



4a+25-9a-16=21

We move all terms to the left:

4a+25-9a-16-(21)=0

We add all the numbers together, and all the variables

-5a-12=0

We move all terms containing a to the left, all other terms to the right

-5a=12

a=12/-5

a=-2+2/5

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